Mechanics in Structural Geology

• 1 Introduction.- Mountains and Human Affairs.- Mountains and the Concepts of Mechanics.- 2 Strains and Displacements.- Linear Strain.- Change of Area and Volume.- Variation of Linear Strain with Direction.- Shear Strain.- Variation of Shear Strain with Direction.- Laminar Materials.- Cumulative Shear Strain.- Linear Strain in Laminar Behavior.- Change of Strain from Point to Point.- Folding.- Surface Waves.- The Mohr Circle and Partition of Strain.- The Mohr Circle.- Change of Area, Change of Shape.- Answers.- 3 Forces and Stresses.- Relating Forces and Pressures to Daily Experience.- Relating Pressure to Depth.- Force Balance, Weight Versus Pressure.- Force Balance, Shear Stress Versus Weight.- Force Balance, Shear Stress Versus Pressure.- Force Balance: Shear Stress, Weight, and Pressure.- Summary and Generalizations.- Stresses at an Interface.- Planes Oblique to Each Other.- Change of Stress from Point to Point.- Stress Fields.- Answers.- 4 Variation of Stress with Direction.- Stress on Oblique Planes.- Mohr Circle and Sine-Wave Diagram for Stresses.- Summary of Stress Relations.- Refraction of Stress.- Stress Relations in Three Dimensions.- Answers.- 5 Rheology: Relations Between Forces and a Material’s Response.- Shear Stress, Shear Strain, and Viscosity.- Summary and Comment.- Relation of GTU and GVU to Standard Units.- Normal Stresses and Linear Strains.- Summary and Comment.- A Rock Has Variable Viscosity.- Variation in Shear Stress.- Principal Stress Inclined to an Interface.- Refraction.- Alternating Multilayers And Anisotropy.- Straight-Limbed Folds.- Behavior of Multilayers.- Change of Volume.- Permeability.- Nonuniform Pressure Gradients.- Direction of Shortening and Direction of Escape.- Summary.- Answers.- 6 Parting.- Two Kinds of Parting: The Failure Envelope.- Attitudes of Faults and Fractures.- Inhomogeneous Rock and Thrust Sheets.- Effect of Pore Fluid on Parting.- Answers.- 7 Concurrent Fracture and Flow.- Links Between the Processes.- A Mohr Diagram for Flow Behavior.- Effect of Pore Fluid on Flow Behavior.- Concluding Example: The Pyrenees.- Answers.- Appendices.- A. List of Abbreviations.- B. Precision and Significant Figures.- C. Weights as Units of Force.- D. Experimental Work on Rock Deformation.- E. Books on Related Material.

From the reviews: "...one of the charms of this book is that it is different from both structural geology text books and mechanics texts. Bayly has brought these two fields together admirably, with great intelligence, imagination and originality. For this reason alone, I think all active structural geologists, whether in research or teaching, and particularly those concerned with theory, should read this book." (Journal of Structural Geology)